diff --git a/lib/AppConfig.php b/lib/AppConfig.php
index 18949b5345..5843f51afe 100644
--- a/lib/AppConfig.php
+++ b/lib/AppConfig.php
@@ -48,6 +48,11 @@ class AppConfig {
 		'watermark_linkTagsList' => 'array'
 	];
 
+	private const INTEGER_KEYS = [
+		'watermark_allTagsList' => true,
+		'watermark_linkTagsList' => true,
+	];
+
 	public function __construct(
 		private IConfig $config,
 		private IAppManager $appManager,
@@ -118,6 +123,10 @@ public function getAppSettings() {
 				$result[$key] = $value === 'no' ? false : $value;
 			}
 		}
+		if (!empty(self::INTEGER_KEYS[$key])) {
+			$result[$key] = array_map('intval', $result[$key]);
+		}
+
 		return $result;
 	}